JP3878142B2 - Fluid heating device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a fluid heating apparatus that is incorporated in a mechanical device or the like and heats a fluid such as water flowing in a pipe to an appropriate temperature during the flow.
[0002]
[Prior art]
There are two types of devices that heat fluid such as water in a pipe in a fluidized state, and those that heat from the outside of the pipe and those that provide a heating means in the passage inside the pipe. What is provided inside has an advantage that a space is not required, and is selected and used in many mechanical devices. As a conventional fluid heating apparatus of this type, as shown in FIG. 5, a cylindrical body 91 that is in the horizontal direction (the same direction as the fluid flow direction) is provided in an adjacent pipe in the middle of the pipe. A heating unit 92 that is coaxially connected to the cylindrical body 91 is inserted at one end of each, and an inflow port 93 is provided on one end side, and an outflow port 94 and a temperature sensing unit 95 are provided on the other end side.
[0003]
As another type of apparatus, for example, a cylindrical heater having a heating element embedded in a cylinder, open at both ends and having one end as a fluid inlet, as in Patent Document 1, for example, has an opening in a bottomed cylinder. As a configuration that is inserted coaxially into an outer cylinder provided with a fluid outlet in a circular portion, between the tip of the cylindrical body of the cylindrical heater and the inner bottom of the bottomed cylindrical body of the outer cylinder, and of the cylindrical heater A fluid heater unit is disclosed in which a space is provided between a cylindrical outer peripheral surface and an inner peripheral surface of a bottomed cylindrical body, and fluid is circulated from the inside of the heated cylindrical heater to the outer periphery for heating.
Further, as another type of apparatus, for example, a U-shaped heating element is provided in a cylindrical casing in which a fluid inlet and a fluid outlet are linearly provided on the same horizontal plane as in Utility Model Document 1. The heater is provided with a plate-shaped barrier in the longitudinal direction of the housing, and the interior of the housing is divided into approximately two chambers, and the flow path extends from the inlet to the outlet along the surface of the U-shaped heating element. A heater is disclosed which forms
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 9-49660 [Utility Model Literature 1]
Japanese Utility Model Publication No. 53-153535
[Problems to be solved by the invention]
However, in the conventional heating device as shown in FIG. 5, since a heating unit is connected to one end of the cylinder and inserted, when the heating device is inserted in the middle of the piping, the fluid is supplied to the cylinder. Since both the inflow port and the outflow port cannot be directly connected directly to both ends of the cylinder, at least one of them needs to be provided on the side of the cylinder as shown in FIG. As assumed when installing in the middle of piping, in order to position an inflow port and an outflow port on a straight line on the same horizontal plane, it is necessary to perform piping by combining a plurality of joints as shown in the figure. Moreover, since a cylinder is attached horizontally with respect to the longitudinal direction (flow direction) of surrounding piping, a long space in the longitudinal direction is required. Furthermore, when the length of the internal heater needs to be changed due to, for example, a change in the capacity of the heating unit, the length of the cylindrical body also needs to be changed. Since the arrangement space is fixed to a predetermined length, this change affects the entire piping and is difficult to perform easily. Thus, there is a problem that the changeable width from the initial design stage is small and maintenance is difficult.
[0006]
Moreover, in the apparatus like patent document 1, since the direction of the inflow port and the outflow port with respect to the cylinder is not linear in the same horizontal plane as described above, there is no problem if it is incorporated in a specific mechanical device or the like. However, assuming that this type of heating device is incorporated in the middle of the most general linear piping, the piping needs to be complicated. In addition, when changing or replacing the heating element (maintenance), in addition to the need to replace the entire cylindrical heater, it is necessary to first remove the piping around the water flow port. There is also the problem of being troublesome. Furthermore, there is a problem in that heat is discharged from the heating device to the outside because the structure is such that a cold fluid flows through the center of the heating device and the heated liquid flows outside.
On the other hand, in the apparatus such as Utility Model Document 1, since there are an inflow port and an outflow port in a straight line on the same horizontal plane, there is general versatility of attachment to a pipe. It is not always easy to take out. In addition, although the heating effect is considered because the length of heating using the U-shaped heater is long, the heat loss of the heat released from the cylindrical body serving as the outer wall of the heating device is considered. There is a problem that energy is wasted.
[0007]
Therefore, the present invention does not require many joints for attachment to a mechanical device or the like, and piping is easy.Even after the device is installed, the heater capacity can be easily changed and maintained, and the heating device can be externally connected. An object of the present invention is to provide an efficient fluid heating apparatus that minimizes heat released to the heat source and that has a small heat loss.
[0008]
[Means for Solving the Problems]
The fluid heating device of the present invention includes an outer cylindrical tube of a cylindrical box that communicates a fluid inlet and a lumen, a gap that is coaxial with the outer cylindrical tube, and a fluid outlet and a lumen. A cylindrical inner tube that communicates with each other, a heating unit that is surrounded by a gap in the inner tube, and a temperature sensing unit that is provided near the outlet for controlling the temperature of the fluid. A fluid flow path is formed in the flow path of the inlet, the gap between the outer cylinder pipe and the inner cylinder pipe, the gap between the inner cylinder pipe and the heating unit, and the fluid outlet.
[0009]
It was set as the structure arrange | positioned so that the longitudinal direction of the said outer cylinder pipe, an inner cylinder pipe, and a heating unit may become a right angle with respect to the flow direction of the fluid which flows through the piping adjacent to this fluid heating apparatus.
[0010]
The fluid inflow port and the fluid outflow port are respectively approximately on the upper end side of the outer tube and the inner tube (the end on the side opposite to the bottom and on which the channel can be set the longest). It was configured to be T-shaped and provided on the same horizontal plane (basically a straight line).
[0011]
Further, the heating unit and the temperature sensing unit are connected to the fluid heating device by, for example, screwing or the like, and can be freely attached and detached.
[0012]
As a more specific device configuration, the fluid inlet and the fluid outlet are integrally integrated in advance, and the outer cylinder tube, the inner cylinder tube, the heating unit, and the temperature sensing unit can be attached to the lid portion. Provided.
[0013]
Further, the heating unit is an electric heater such as a sheathed heater in which a heating element is arranged inside a cylindrical pipe, and is provided so as to be coaxial with the outer cylindrical tube and the inner cylindrical tube.
[0014]
[Action]
According to this means, the inner cylinder pipe and the outer cylinder pipe are arranged as a double pipe surrounding the heating unit, and the fluid flowing in from the inlet on the upper end side of the outer cylinder pipe is the outer cylinder pipe and the inner cylinder pipe. By making a U-turn at the bottom and passing through the gap between the inner cylinder pipe and the heat generating unit while heating the gap between the inner cylinder pipe and the heat generating unit, a flow path that flows out from the outlet on the upper end side of the inner cylinder pipe is formed. The cold fluid flows through the gap between the outer tube and the inner tube that is the outer wall of the device while being preheated, and it is heated by the gap between the heat generating unit and the inner tube that is heated inside the device. Since the heat of the fluid is transferred to the cold fluid in the gap between the inner tube and the outer tube that are in contact and does not reach the outside of the device, compared to the conventional heating device in which the heated fluid is in direct contact with the outer wall, There exists an effect | action which suppresses the heat discharge | released outside from the outer cylinder pipe | tube surface of a heating apparatus to the minimum.
[0015]
In addition, the flow direction of the surrounding fluid (which agrees with the direction of the piping) is perpendicular to the longitudinal direction of the outer tube, the inner tube, and the heating unit, and the fluid inlet and outlet are the outer tube and the inner tube. Because it is configured to be basically straight on the same horizontal plane on the upper side of the tube (linear with the flow direction of the surrounding fluid and perpendicular to the longitudinal direction of the outer tube, inner tube, and heating unit) When installing in the middle of piping such as machinery, etc., in the middle of the most general linear piping, it can be connected to the inlet and outlet of the heating device with the minimum number of joints. The space in the longitudinal direction (flow direction) can be shortened. In addition, this configuration affects the entire piping even when the length of the internal heater needs to be changed due to, for example, changing the capacity of the heating unit after assembly to the mechanical device. There is an effect that it is possible to easily replace only the heating unit or the present heating device without any problems. Furthermore, if the heating device is installed in the vertical direction, which is assumed to be the most common attachment means, the heating part will be located below the adjacent piping, inlet and outlet, and always water or the like inside. In the state where the fluid is accumulated, it can be expected to prevent an unexpected burning due to a water stoppage or the like.
[0016]
On the other hand, in addition to the above-described configuration, the heating unit and temperature sensing unit can be freely attached and detached, so that the heating unit and temperature sensing can be performed without separating other parts of the heating device or surrounding piping attached. There is an effect that a part requiring maintenance at a relatively high frequency can be easily removed.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
An example of the fluid heating apparatus of the present invention will be described in detail with reference to the drawings.
[0018]
FIG. 1 shows a cross-sectional view of a fluid heating apparatus showing an example of an embodiment of the present invention. The fluid heating apparatus of the present example includes a cylindrical outer cylindrical tube 1 having a bottom portion 12, a cylindrical inner cylindrical tube 2 that is coaxial with the outer cylindrical tube 1 and is included with a gap, and the inner cylindrical tube. The heating unit 3 that is coaxially surrounded by the gap 2 and the upper end of the outer tube 1, the inner tube 2, and the heating unit 3 can be attached to the outer tube 1 and the inner tube 2. Measures the fluid temperature in the vicinity of the outlet 5 as well as the lid body portion 7 having the inlet 4 to the apparatus, the inlet passage 41 that follows this, and the outlet 5 and the outlet passage 51 that follows this. For this purpose, the temperature sensing unit 6 is provided connected to the lid 7.
[0019]
Looking at each part in detail, the outer tube 1 has a bottom 12, forms a cylindrical casing with the lid 7 as an upper lid, an inlet 4 provided in the lid 7, and an inlet subsequent thereto The passage 41 and the inner cavity communicate with each other, and a gap between the inner peripheral surface and the outer peripheral surface of the inner tube 2 is configured as the fluid outer passage 11.
The inner cylindrical tube 2 is formed as a cylindrical body having the lid body portion 7 as an upper lid and having no bottom, and is disposed coaxially with a gap between the outer peripheral surface and the bottom portion inside the outer cylindrical tube 1. The outlet 5 to be provided and the outlet passage 51 subsequent thereto communicate with the inner cavity, and as described above, the gap between the outer peripheral surface and the inner peripheral surface of the outer tube 1 is set to the fluid outer passage 11, the inner peripheral surface and the later description. A gap with the heating unit 3 is configured as an inner passage 21.
In this example, the heating unit 3 uses a cylindrical sheathed heater and is attached to the inner cylinder tube 2 with a gap on the peripheral surface so as to be detachable from the lid body part 7 through the lid body part 7. As described above, the gap between the peripheral surface and the inner peripheral surface of the inner tube 2 is configured as the fluid inner passage. (Details will be described later)
The lid portion 7 has the fluid inflow port 4 and the outflow port 5 preliminarily perpendicular to the longitudinal directions of the outer tube 1, the inner tube 2, and the heating unit 3 and is linearly positioned on the same horizontal plane. Each of them communicates with the outer passage 11 and the inner passage 21 through an inlet passage 41 and an outlet passage 51, respectively. And the outer cylinder pipe 1, the inner cylinder pipe 2, the heating unit 3, the piping to the inflow port 4, the piping to the outflow port 5, and the attachment part of the temperature detection part 6 are each provided and comprised. (Details will be described later)
The temperature sensing unit 6 is a sensor for controlling the temperature of the heating device. In this example, a known sheath type resistance temperature detector is used so that the fluid temperature near the outlet can be measured. In addition, it is configured to be fixed and attached to a fixture 61 or the like having a screw part so as to be detachable in the vicinity of the outlet 5 of the lid part 7 and connected to a temperature control device (not shown).
[0020]
FIG. 2 is a cross-sectional view showing an example of the lid portion of the present invention, and only the heat generating portions of the outer tube 1, the inner tube 2, and the heating unit 3 are indicated by dotted lines for easy understanding. . The lid portion 7 of this example includes an upper lid portion 71 to which the inner tube 2 is welded and a lower lid portion 72 to which the outer tube 1 is welded, and the lower surface of the upper lid portion 71. The upper end peripheral edge of the inner cylindrical pipe 2 is welded to the inner cylindrical pipe attaching portion 74 on the side, and the upper end peripheral edge of the outer cylindrical tube 1 is welded to the outer cylindrical pipe attaching portion 73 on the lower surface side of the lower lid portion 72. After that, the two are connected. In addition, in this example, although the attachment means of the cover part 7 and the inner cylinder pipe 2, and the cover part 7 and the outer cylinder pipe 1 was welded, this is detachable, for example, as shown in FIG. A protrusion 81 is provided on one side of the lid 7 or the inner tube 2 or the outer tube 1 and a key groove such as an L-shaped groove 82 that engages with the protrusion 81 is provided on the other side to engage with each other. It is more preferable to use a means that maintains airtightness by attaching and packing, etc., because maintenance such as cleaning after installation can be facilitated by the action of being easily attached to and detached from the lid body portion 7.
[0021]
In addition, an inlet 4 and an outlet 5 are provided on the side surface of the lid body 7, and this heating device attaches the longitudinal direction of the device at right angles to the flow direction of the pipe in the middle of the straight pipe. Therefore, the pipe joints that are set at right angles to the longitudinal direction of the outer cylinder pipe 1 and the inner cylinder pipe 2 and on a straight line on the same horizontal plane and adjacent to the inlet 4 and the outlet 5 respectively. Female threaded portions 76 and 77 are provided as connecting portions, and the inlet 4 communicates with the outer passage 11 at the inlet 4 and the outlet passage 51 communicates with the inner passage 21 at the outlet 5. It is provided and configured. In this example, the inflow port 4 and the outflow port 5 are provided at the positions where the straight pipes are installed in order to be attached to the middle of the straight pipes as described above. The inlet 4 and the outlet may be arranged at an appropriate angle on the same horizontal plane.
Furthermore, on the upper surface side of the lid portion 7, a female screw portion 75 serving as a mounting portion for the heating unit 3, which is detachably provided through the lid portion 7 at a position coaxial with the inner tube 2. And a female screw portion 78 that is installed in the outlet passage 51 in the vicinity of the outlet 5 and serves as a mounting portion for the heat-sensitive portion 6.
[0022]
FIG. 3 is a partial sectional view showing a heating unit according to an example of the present invention. In this example, a cylindrical sheathed heater provided with a flange portion is used. In the sheathed heater, a heating wire 33 such as a nichrome wire is wound around a core 32 that is a core obtained by firing magnesia ceramic or the like inside a hollow metal sheath 31 made of stainless steel or copper, and the heating wire 33 and the sheath 31 are wound. The sheath is filled with an electrical insulating agent 34 such as magnesium oxide so that it does not come into contact with the end portion, and naturally the end of the heating wire 33 is inside the terminal cap 37 provided at the end of the sheath. Connected with lead wire. This heating unit is configured by providing a screw 35 and a plug 36 for attaching and detaching work between the end portion of the sheathed heater and the terminal cap 37, which are connected to the lid portion 7. It is detachably connected to the female screw portion 75 of the lid body portion 7.
[0023]
Here, when the flow path of the fluid is confirmed again, the cold fluid that has flowed in from the inlet 4 changes the flow to the right angle in the inlet passage 41, and the outer passage 11 (the outer peripheral surface of the outer tube 1 and the outer periphery of the inner tube 2). The surface gap) flows while being slightly preheated, makes a U-turn at the bottom 12 of the outer tube 1 and flows into the inner passage 21 (the space between the inner surface of the inner tube 2 and the surface of the heating unit 3). The passage 51 flows while being heated, and the flow is changed again in the right-angle direction in the outlet passage 51 to follow the path through which the heated fluid flows out from the outlet.
[0024]
【The invention's effect】
According to the fluid heating device of the present invention, it is possible to minimize the heat generated by the heating unit from being radiated to the outside of the heating device by the above-described configuration and operation, and thus the loss of heat that wastes energy. Therefore, it is possible to provide an efficient fluid heating apparatus with a small amount of.
[0025]
In addition, due to the configuration and operation described above, piping is easy without the need for many joints, and no space is required in the longitudinal direction of the surrounding piping. With a configuration that has little influence on other piping, etc., it is possible to change the heater capacity, etc. even after installation in the equipment, and maintenance of the heating unit etc. is easy, so it is widely used and versatile. An easy-to-use fluid heating apparatus can be provided.
[Brief description of the drawings]
FIG. 1 is a structural cross-sectional view showing an example of a fluid heating apparatus of the present invention. FIG. 2 is a structural cross-sectional view showing a lid portion of an example of a fluid heating apparatus of the present invention. FIG. 4 is a schematic sectional view showing an example of a connecting means for connecting the lid portion and the outer cylindrical tube or the inner cylindrical tube of the present invention. FIG. 5 is a schematic diagram showing an example of a conventional fluid heating apparatus. Figure [Explanation of symbols]
1. Outer tube 11. Outer passage (gap between outer tube and inner tube)
12 Bottom 2. Inner tube 21. Inner passage (gap between inner tube and heating unit)
3. Heating unit 31. Metal sheath 32. Core 33. Exothermic wire 34. Electrical insulation 35. Screw 36. Plug 37. Terminal cap 4. Fluid inlet 41. Inlet passage 5. Fluid outlet 51. Outlet passage 6. Temperature sensing unit 61. 6. Sensor mounting plug Lid part 71. Upper lid part 72. Lower lid part 81. Protrusion 82. L-shaped groove

Claims (6)

An outer tube of a cylindrical box that communicates a fluid inlet and inlet passage (hereinafter simply referred to as inlet) and a lumen;
A cylindrical inner tube that communicates with the fluid outlet and outlet passage (hereinafter simply referred to as outlet) and the lumen, and is contained coaxially with the outer cylindrical tube;
A heating unit surrounded by a gap in the inner tube,
In order to control the temperature of the fluid, it consists of a temperature sensing unit provided near the outlet,
A fluid heating apparatus comprising: a fluid inlet, a gap between an outer cylindrical tube and an inner cylindrical tube, a gap between an inner cylindrical tube and a heating unit, and a forward path of a fluid outlet. The fluid heating apparatus according to claim 1, wherein longitudinal directions of the outer tube, the inner tube, and the heating unit are perpendicular to a flow direction of a fluid flowing in a pipe adjacent to the fluid heating device. The fluid heating device according to claim 1, wherein the fluid inlet and the fluid outlet are provided on the same horizontal plane on the upper end side of the outer tube and the inner tube, respectively. The fluid heating device according to claim 1, wherein the heating unit and the temperature sensing unit are freely detachable from the fluid heating device. The fluid inlet and the fluid outlet are integrally provided, and a cover body portion to which the outer cylindrical tube, the inner cylindrical tube, a heating unit, and a temperature sensing unit can be attached is provided. Fluid heating device. The fluid heating device according to claim 1, wherein the heating unit includes an electric heater in which a heating element is disposed inside a cylindrical pipe, and is provided coaxially with the outer cylindrical tube and the inner cylindrical tube.

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